Calling device



' May 29, 1923. 1,456,602

w. KAISLING CALLING DEVICE v Original Filed Jan. 17, 1920 2 Sheets-Sheet 1 Enamel May 29, 1923.

W. KAISLING ICALLING DEVICE I ori ml Filed, Jan. 17, 1920 2 Sheets-Sheet 2 HZTEfHE Patented May 29, 1923.

" ar n WILLIAM KAISIJING, OF CHICAGO, ILLINOIS, ASSIGNOR T KELLOGG' SWITCHBOAIRZD AND SUPPIIY COMPANY, OF -CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

CALLING DEVICE.

- Application filed January 17, 1920, Serial No.'352,001. Renewed November 23, 1922.

T 0 all whom it may concern Be it; knownthat I, lVILnIAM- KAIsLING, a citizen of the United States, and residing at Chicago, county of Cook,- and State of Illinois, have invented Certain new and useful Improvements in .Calling Devices, of which the following is a specification.

My invention relates to calling devices and has to domore particularly with calling=devices such as are commonly used in telephone-substations for controlling automatic switches which are located at the central officeby directiveimpulses to extend a connection :from a. calling substation to' a called substation through .the agency of the said switches.

invention. is .particula1-'ly. adapted to operate-in conjunction with the so-called metallic or two-wiretype of automatic circuits in which theflcircuit of .the line is. in-,

terrupteda number of times,determined by the adjustment ofv .the calling device. The principalobjec't of my invention is to pro Videa device of the character above described which .willbe certain and efficient in operation, simple in construction and I economical to .manufacture.

A. feature. of: myuinvention .is the provision of positive means. whereby, upon the settingmovement. of the, dial, the contact operation, which interrupts the impulse springs, isgprevented from rotating forward and separating the said' impulse springs. Other features.oimyinvention relate to the governor,.to the ratchet mechanism which connects the setting.,men1ber or dial. to the impulse controlling means and to theconstruction .and operation of the contact springs and contact operator. The above and other features and. advantages herein described will be better understood upon reference. to the following detailed description taken in connection with the accompanying drawings, and the scope of the invention will beparticularly pointed out in the appended. claims.

Referring now more particularly to the accompanying drawings, in which I illustrate; the calling device in the several views and. in which like reference characters indicate. like .parts,..and in. which- Fig. lis a; face view of the calling device;

Fig.2:isa. rear view of Fig. 1;

Fig. 3.1isja right side View of Fig. 9;

Fig. i isaytop view of. Fig. 2;

F ig. 5 is a bottom view of Fig. 2 with certain parts broken away;

Fig. 6 is a sectional viewalong the line 6*6 of Fig. 5; i

Fig. 7 is a sectional View along the line 7-7 of Fig. 2;

' Fig. 8 is a sectional view S-8 of Fig. 5;

Fig. 9 is a plan view of the device showing the latch mechanism when the device is at normal;

' F ig. l0 is a View similar to Fig. 9. but showing the apparatus in an actuated position; and

Fig. 11 is a perspective View of the governor.

Referring now more in' detail to my invention as illustrated in the accompanying drawings, it comprises a main mounting plate 1 having a flanged portion 2' anda forwardly extending cup portion 3. A main shaft. 4 extends through'th bearing of the cup-shaped portion 3', the said'shaft. 4 having a finger hold actuating member 5 fastened to it in any suitable' manner, it being preferably staked to the forward end'o'f the shaft 4;. The finger hold actuating member 5 is provided with a plurality of openings or finger holds 6, preferably ten in number. A number indicating disk 'Z'is placed with its indicating numerals below the actuating member 5 and rests upon'the. flange2, the number of said numerals correspondingwith the number of finger holds 6. The indicating disk 7 has a protective disk 8 of transparent material, such as glass, placed in front of it so asto prote'ctthe indicating disk. The members 7 and 8 are held in place upon the flanged portion 2 by means of a split ring 9,thering.fitting into a groove cut in the periphery ofthe forwardly extending cup-shaped member 3',the ring 9, when resting in its place in thegroove l0, securely holding the members 7 and 8 in place upon the flanged portion 2. v

The. ten openings which form the finger holds 6 are numbered 1', 2, 3, etc.', to" O. The calling device'is adapted totransmit from 1 to 10 impulses, the said numerals upon the indicating disk 7 indicating the number of impulses its corresponding. finger hold is adapted to transn'iit'through the agency of the set of impulse springs. The actuating member 5 is provided with a card 11 and. a transparent protecting disk 12, the said along the line Ill) card 1-1. and protective disk 12 being held in place by means of a clamping ring 13 which 1s fastened to the actuating member 5 in any suitable manner, as by means of-the screws 14, which have screw-threaded engagement with the actuating member 5. The card 11 contains instructions relative to the opera tion of the device. A stationary finger stop 15 is mounted upon the flanged portion 2 of the mounting plate 1, by means of screws 16. When the finger hold actuating member 5 is advanced in a clockwise direction, the advancing finger of the operator engages the stationary finger stop 15 and arrests the forward movement of the actuating member.

1 bearing 17. A spiral motor spring is L coiled around the bearing 17 and sleeve 19. One end 21 of the spring engages one of a pluralityof lugs 22, which lugs 22 are preferably, integrally" formed with the bridge plate 18 by means of a sl iearin'g and forming operation. The spring 20 restores the finger hold actuating member 5 to its normal position after the same has been advanced and then released. An arm 23 is provided which has a square orifice which fits over the square portion24 ofthe shaft 4 and is held in place by means of a screw 25, which has screwthreaded engagement with the shaft 4. The arm23 operates the so-called shunt springs and also serves to retain the motor spring 20in place; The arm 23 is'provided with a downward angular extension 26, which extension 26 forms a securing means for the end 27 of the motor, spring 20, the said end 27 being hook-shaped so as to permit its being hooked. over the extension 26. To secure theproper tension of the motor spring 20, the end 21 of the spring 20 is moved in a clockwise direction over the lugs 22 until the proper adjustment or tension is secured; the end 21 of the spring 20 is then placed so 7 that it engages one of the plurality, of lugs 22, to thus hold the spring 20 under its normal tension and also hold the finger hold actuating member 5 in its normal position.

Positioned beneath the bridge plate 18 on themain shaft 4 is a ratchet 30 which is provided with a collar 31 through which the said shaft 4 extends. The ratchet 30 is fas tened to the shaft' 4 by means of a pin 32 which ,passesthrough a transverse orifice in the shaft 4. Positioned directly beneath the ratchet 30 and rotatably mounted upon the shaft 4 is a gear wheel 33, the said gear wheel 33 being loosely mounted upon the said shaft 4. A pawl34 is pivotally secured shaft 39,which shaft 39 is journaled in the its other or free end engaging pawl mounting plate 1 and in the bridge plate 18,

the bridge plate 1.8 being fastened to the mounting plate 1 by means of screws 40, 41.

and 42, which screws pass through spacing washers 43, which washers are placed between the bridge plate 18 and mounting plate 1, the said screws having screwthreaded engagement with the mounting plate'l. A pinion 44 formed integrally with the shaft 39 meshes with the gear 33. A gear wheel 45 is suitably securedtoa shaft 46', which shaftv46 is journaled at its op-' posite ends in the mounting plate land bridge plate 18. A pinion 47 formed integrally with the shaft46 meshes Iwiththe gear38. Shaft 48 of the governor mechanism G is provided with a pinion 49integrally formed with the said shaft 48 and meshes with the ear wheel 45. The governor mechanism is adapted to retard the return movement of the finger hold actuating member 5 to a predetermined speed, as will be more fully hereinafter described.

'To retain the finger holdmember 35 in its normal position against the tension of the motor spring 20, I provide ah arm 50 loosely mounted upon the main shaft4 between the mounting platev 1 and finger hold actuating member 5. The arm 50 is provided with an angular extension 51, which projects through a suitable opening 52' in the cupshaped portion 3 of the mounting plate "1. A leaf spring 53 is provided and has one end secured to the mounting plate 1 and its'free end engaging the arm 50. A pin 54 is secured to the inner face of the finger hold actuating member 5 and when the said member 5 is in is normal position, the pin 54 engages the arm 50, turning the said arm about shaft 4, forcing the extension 51 which protrudes through'the'cup portion 30f the mounting plate 1 into engagement. with'the pinion 44, against" the tension of the leaf spring 53. The tension of the said spring 53 is overcome by the tension of the motor spring 20. Should the member 5 be advanced in a clockwise direction, the pin 54 moves with the member 5 away from arm 50, allowing the leaf spring 53 to movethenose of the angular extension 51 out of engagement with the pinion 44. When the member 5 restores to normal, the pin 54 again.

forces the nose of the extension 51 into enesa-e02 gag ment with the pinion 44, thus arresting the movem ntofthe-member 5.; The. nose of the extension .51 engaging-the pinion 44 prevents overrun operation. of thetimpulse zinechanism.

The governor mechanism G comprises a haft 48, which hasa pinioin49v formed integrally h rewith, was. hereinbefore linentioned, the said pinion-meshingwith the gear wheel 45 uponshaft 46.; A pinion 47 integrally formed with theshaftg46 meshes with the gear wheel 38 which is carried uponthesha-ft139; The pin on 44 which is integrally formed with, the shaft 39 meshes 7 with'the gear-wheel-33 which is loosely mounted upon the-main shaft- 4, g Thetrain of gearing thus outlined connects the gover-nor mechanism G with the main shaft 4. The governor proper comprises a plate 60 of thin, flexible material formed into diametrically, oppositely disposed. arms 61, which arms 61 are provided with angular extensions 62. The free ends 63 of the arms 62 are provided with weighted members 64.

-' The plate 60 is suitably secured-to a collar 65, which collaris provided with an orifice of a size to receive the-shaft 48. The governor as a whole is slipped over theshaft 48 into a cup-shapedmember 66, which member 66 is rigidly secured to the bridge plate 18 in any suitable'manner, and forms a con.- taining, member for the said governor mecha-- nism G. The member .60 and-collar as a whole are held in position upon the shaft 48 by meansof a set screw 67.

The governormechanism G is operatively assooiatedwith the train of. gearing before mentioned and when the finger holdactuating member 5 is rotated in a clockwise direction to set. the Calling device to transmit a certain number of impulses, the gear 33, which is loosely mounted upon the shaft 4, remains stationary whilethe shaft 4 and ratchet 30 are opera-ted in a clockwise directionso that the pawl 34, which is pivoted upon the gear wheel .33, rides over the, teeth of the ratchet until thepawl rests in the desired tooth of the ratchet 30. Upon-.- the return movement of the finger hold actuating member 5 with the .shaft4 and ratchet 30,, the, pawl 34 engages a tooth of the ratchet wheel 30, causing the gear 33 to be rotated with it, and through the medium of the train of gearing the motion is transmitted to the governor mechanism G.- The weighted free ends 63 of extensions 62 are moved outward against the normal tension of the semi-circular members 62; due to centrifugal force and the weights 64 are forced against the inner periphery of the cup-shaped member 66, thus retarding the-return movement of the device to a predetermined speed.

In order to operate the impulse springs of the device, I preferably-provide an in-, terrupter or cam member of insulating material mounted upon the shaft 39 and held in place thereon by means of a nut 71, which has screw-threaded engagement with the threaded portion of the shaft 39, and a suitable washer 72 is placed between the. nut 71 and the interrupter cam 70. The cam .70 is positioned between the interrupter contacts, that is, the axis of rotation of the cam is between the interrupter contacts, so that when the cam. is in itsnormal position, its wing members extend parallel to the interrupter contacts but free from engagement therewith, permitting the contacts carried by the interrupter springs to engagceach other. Vhenthe cam member is rotated its wings engage the interrupter springs to open their contacts. 1 The ratchet 30 hereinbefore described has twelve teeth 30. When the member 5 is moved in a clockwise direction, the pawl 34, engages the successive teeth 30' of the ratchet in its advance movement. To prevent the interrupter 70 from opening the interrupter springs, I provide a spring latch 75 secured to the impulse spring support 76. The cam 70 is provided with wings 7 0 and 70 The latch 7 5 is provided with an angular nose 77 which engages the cam member 70, and on the setting operation of the device, a partial rotation of the cam 70 brings a shoulder 70 of the wing 70 or 70 into engagement with the nose 77 of the latch 75, arresting the forward movement of the interrupter cam. When the member 5 starts its return movement in a clockwise direction, the said pawl 34 remains in engagement with the ratchet 30, thus operating the ratchet 30, the loosely mounted gear 33, the train of gearing connected thereto and interrupter 70.

The normally closed interrupter or im pulse springs 78 and 79 are actuated according to the number of impulses to be trans mitted by the cam member 70. The impulse springs 78 and 7 921m so spaced that the cam member 7 0 normally rests between the springs 78 and 79. with the wings 70 and 70 extending parallel to the interrupter springs. The freeends of the springs are formed as shown in Fig. 2'and are provided with contact points. The nose 77 of the latch 75 passes through a suitable orifice in the spring 78, permitting the said latch to engage the cam member 7 O. The springs 78 and 79 are insulatingly secured to the support 76 which is secured to the bridge plate 18 by means of screws 80. The support 76 also holds the shunt springs in position.

Vhen the actuating member 5 is rotated in a clockwise direction, the ratchet 30 moves with the shaft 4, the pawl 34 rides over the teeth'30' of the ratchet 30', due to the gear wheel 33 being loosely mounted upon the shaft 4, but onthe return movement, the pawl 34 engages a tooth 30 of the ratchet corresponding to the number of impulses to be sent. The gear wheel 33 is then rotated in a counter-clockwise direction, duefto the motor spring thereby transmitting power mechanism in the manner justdescribed.

This is due to the fact that each opening of the interrupter springs for each impulse of the series is for the same duration or period of time. The devices of the-prior art have been found somewhat objectionable for use in two-wire systems,'owing to the fact that their interrupter mechanism was provided with a plurality Ofinterrupters for separatingthe interrupter springs, and as the different interrupters vary somewhat in their shape or size, the impulses trans mitted were not of the same duration. Even though the different 'interrupters of the interrupter device might have been substantially the same shape or size when the device was first made, they wore differently as the'devlce was used, thus causing the device to transmit impulses of different .dura-- tions. With my device, which isprovided with only one interri'ipter, the impulses are always of the same duration.

I provide, asfhereinbefore mentioned, shunt springs by which the subscribersapparatus may be short circuited while the impulses are being transmitted. The shunt springs comprise a pair 'of'normally open contact springs 85. and 8 6,'the spring 85 being conductivcly connected with the impulse spring 7 8. The springs 85 and 86 are also mounted upon the support '76. When the calling device is at normal, the arm 23 secured to the shaft 4 engages an insulation buffer 87 mounted upon" the. extension 85 of the spring 85, and holds the shunt springs normally disengaged. When the member 5 is moved off normalthe shaft 4 is rotated and the arm 23 moving therewith disengages the buffer 87, allowing the shunt springs 85 and 86 to close and remain in suchiposition until the arm 23 again engages buffer 87, upon the completion of the return movement ofthe member 5. 3

Lugs 90 are provided, whichare integrally.

formed with the plate 1 by means of a shearing', and. forming operation, the said lugs forming a means for fastening the dial to a telephone instrument or other device.

I will now describe brieflythe operation of the device. Let us assume that the opera tor wishes to effect four operations of the impulse contacts 7 8 and 79, that is, to trans mit four .impulses, the finger of the operator will be inserted into a-finger hold 6 above the number 4 on the indicating disk, andthe member 5 is rotated in a clockwise direction until the finger of the operator engagesthe ing the nose or extension 51 to disengage 'pinion 44. 'Aslight movement, as already described, of the mechanism is brought about, but is arrested when the nose 7? of the latch spring 7 5 engages a shoulder of-the "cam membenFO. The gear 33 is loosely mounted upon the shaft 4 and, therefore, upon this forward movement the said gear 33 remainsnormal and as the pawl 34 ispivoted to the gear it rides over the teeth 30 of the said ratchet 3Q. Asthe shaft-4 leaves normal upon its fomvarclirotation, the arm'23 carried thereby disengages the rubber buffer 87 of the] shunt spring 86, allowing'the shunt springs and 86 to' close their contacts to short-circuit the substation apparatus. The adjustment of the member 5 winds up the motor spring 20 so that when the finger'of the operator is removed from the finger hold 6 of the actuating member 5, thespring' 2O restores the shaft 4,ratchet 30 and arm 23 to normal. The pawl 34 inowengages' a tooth 80" of the 'ratche'tBO and the ratchet 30 carries the gear 33with it; and motionis transmitted to the goveriior ,mecha-nismi'Cr through the agency of the train of gearing,

thus permitting the restoration of the calling device at a predetermined speed. Motion is also transmitted" to "the shaft "39 to brin'g i abou'tthe rotationl'of the 'cam'member 70,

causing the contact springs 7 8,and 7 9jto be I interrupted four time'sto transmit the four impulses to thecentral office to operate the central office switches; Uponithe' return to normal of the device,the pin 54 again en'- gages arm 50, forcing the extension 51"into engagement with a' tooth of the pinion 44,

thereby'immediately arresting further rotation of the/impulse .cam 70. The arm 23 again engages'the rubber buffer 87 mounted upon the spring 86, thus interrupting the shunt springs 85 and.

86. The devicejis" now atj normaland is again ready to be adjusted to effect the transmission of-another setofimpulses. f "Inillustrating m invention I have shown a specific form "of, apparatus but I do not wish tobejlimited to the exact structure as shown, as many modifications and changes may; readily suggest themselves to those skilled in thei art, and therefore I aim to cover all such changes and modifications as come withintl1e' spi rit and scope of the appended claims. :What I claimas new and desire to secure by United; States Letters Patent, is:

A device of the character described ine se Leeaooe eluding a pair of interrupter contacts, an interrupter provided with a pair of wings normally resting between a pair of interrupter springs to which said interrupter contacts are connected, means for rotating said interrupter whereby the wings of said interrupter engage said springs to disengage said interrupter contacts, and a line circuit controlled by said interrupter contacts.

:2. A device of the character described including a pair of parallel interrupter springs normallyin engagement at their free extremities, an interrupter extending between said springs provided with a pair of wings ly'ingnormally in a plane parallel to the planes of said interrupter springs, means for rotating said interrupter whereby one of said wings engages one of said springs and the other ofsaid Wings engages the other of said springs to cause the one spring to dis engage the other spring.

A device of the character described including a pair of parallel interruptersprings firmly secured to a mounting plate at their one end, the free extremities of said springs being shaped to contact with each. other, a gear train, an interrupter extending between said springs operatively associated with said gear train, a "pair of wings for said interrupter, and means for rotating the same through the agency of said gear train whereby one of said wings engages one of said p i gs, nd he o h r of s ing e a h th f a d Sp i g to Ope o act b en sa d spr ngs 4. A device of the character described including a pair of interrupter springs secured to ,a mounting plate, said springs extending parallel to .each other and having.

their free eXtreInities shaped to contact with each other, ,a gear train supported by said mounting plate, an interrupter device extending between said springs and provided with a pair of wings so arranged that when said interrupter device is rotat d through the agency of said gear train one wing engages one of said springs and the other ing engages the other of said springs to open contact between said springs.

,5. A device ,ofthe character described including a pair of interrupter springs, a mounting plate, means for securing said interrupter springs to said mounting plate, a rear ra n sir-re a e by un ng-P an interrupter device operatively associated ith said se train. and P v de it a pa r ings a l ed t b otate be ween a d a e npter spri s ne o sa d Wings adart mess ge ens pra s a d t th of said wings adapted to engage theother of said springs to separate the same when-Said interrupter is rotated by said gear train.

,6. A device of thecharacter {described ine e mount ng-p ate a ra e par l e a i t l-3 interrupter springs secured to said mounting plate having their free extremities shaped to contact with each other, an interrupter device normally resting between said springs but permitting the same to contact with each other, and a setting member including a gear train, said setting member when advanced and then released causing rotation of said interrupter device through the agency of said gear train whereby the contact between said springs is alternately opened and closed.

7. A device of the character described including a mounting plate, a pair of interrupter springs secured thereto extending parallel to each other and having their free extremities shaped to contact with each other, a gear train secured to said mounting plate, an interrupter device operatively associated with said gear train and normally resting between said springs, a pair of integrally formed wings for said interrupter device whereby when-the same is rotated by said gear train said wings alternately engage the interrupter springs to open and close contact.

8 'A device of the character described including a mounting plate, a pair of interrupter springs secured thereto extending parallel to each other and having their free extremities shaped to contact with each other, an interrupter device normally extending between said springs, a pair of in,- tegrally formed wings for said interrupter device whereby when the same is rotated said wings alternately engage the interrupter springs to open and close said contact, and mechanism for preventing the rorection.

9. A device of the character described including a mounting plate, .a pair of interrupter springs secured thereto, an interrupter device for opening and closing the contact between said interrupter springs, and pawl mechanism for preventing the rotation of said interrupter device in one direction. l

10. An interrupter device of the character described including a pair of interrupter springs, an interrupter device provided with a pair of wings adapted to rotate between said springs to open and close contact therebetween. and a spring pawl adapted. to cooperate with the wings of said interrupter device to prevent rotation of said device in one direction. 7 11. A device of the character described including a mounting plate, a pair. of interrupter springs securedqto said mounting plate, an interrupter device provided with-a pair of wings adapted torotate between said springs to open and close, contac t between d SP es, a a new dapte tweet rate with the wings of said .interrupter device: to prevent rotation thereof in one direction.

12. A device of" the character described including a mounting plate, a pair of interrupter contacts securedv to said mounting .t'errupter-provided with a pair of wings adapted to be rotated to open and close eontact between said interrupter springs, and a eluding a pairof interrupter springs lying in, parallel planes and in contact with each,

third spring extending through an orifice in one of said interrupter springs for cooperat on wlth the wings of said nterrupter to. prevent rotat on -.of said interrupter 1n one direction,

14. A device ofthe character described inother, an interrupter normally resting between said springs, a gear tram assoclated with saidinterrupters; -a setting member for of said setting member.

controlling said gear train, and a motor sprlngassociated with said gear trainto 1 cause rotation of said interrupter in a plane at right angles to, the planes of said springs" to cause theone spring .to, disengage the other sprmg.

15. A device of the character described ineluding a mounting plate, a gear train mountedthereon, impulse mechanism operativelyas sociated.with saidgea-r train at an intermediate point, an interrupter member for said impulse mechanism, a rotatable setting memberfor controlling said gear train,

and a spring secured to said mounting plate and engaging. said interrupter member to prevent anoperative movement of said impulse-mechanism upon the forward rotation 16. A device o f-the character described ineluding a' mounting plate, a gear train mounted-thereon, a shaft and pinion inte: grally formed and positioned at an intermediate point in said gear train, a pair of impulse springssupported by said mounting plate, a cam secured to said shaft and positioned between said impulse springs, 21 1o tatable setting member loosely connected to sa d gear train, and a spring secured to said mounting plate and engaging said cam to prevent movement of said cam member upon.

the forward movement of said rotatable setting memberi 171A device of the character described I including a mounting'plate, a gear train securedthereto, impulse mechanism operatively associated wlth sa d gear train. at an intermediate point including a shaft and pinion integrally formed, a pair ofnorr'nally closed impulse springs secured to :said mounting plate, a cam secured tolsaidshaft and positioned between said impulse springs, ,7

' r 9 parallel to said interrupter springs and'v adapted to engage said impulse springs toand wings forsaid cam normally extending open saidfimpulse sprlngs.

18. A device of the character describedineluding a mounting .plate,\,a:pair of spring members extending parallel to each; other and secured to said mounting plate, Jsa-id spring members having theirfone end: ar-;,

ranged so that they are normally incontact ual engagement with each other, a rotatable member disposed betweensaid spring, mem bers and adapted when rotated to .engage said spring members to open the. contactual engagement between sald sprlngnnembers and then to disengage said springmembers to permit the reestablishmentr'of the con-.

tactualyengagement between said spring members. i

-19LAdevice of the,. characterdescribed; includ ng a mount ng plate, a palrof spring members. secured tosa d mount ng plate and parallel to 'eachother, said 'springsnormally in contactual engagement at one end, a rotatable, member disposed. between 1- said spring members, a gearjtrain associated with and-adapted to rotate said rotatable member, to causesaidrotatable member to i engage said sprlng members to open. 'the, I contactual engagement between said spr ng v ion members and the-n to disengage said spring members to permit said spring members to assume their eontactual engagement.

20. A devieeof hecharacter described ineluding a mountingplate, a pair of spring members securedflat the r one end to said mounting plate, thefree endsof'said spring gagementwith each other, a rotatablev me-mj- .members being normally in eontactual en ber positioned between said spring members and having a pair of wings integrally formed ,therewlth and adapted to engage said sprlng members .whenrotated to open the contact between said spring members i;

and also to disengage said spring members to permit the closure of the contact between said. spring members, a spring-driven gear, train for rotat ng sald rotatable member,

speed of said gear train.

21'. A device of the character described in cluding amounting plate, a pair of contact and frictional means for regulatingithei springs norinally in contactual engagement with .each other, said contact springs secured to said mounting plate and paran 61 each other, a member disposed between said contact springs, a cup-shaped member, ,a

spring-driven gear train. positionedin said cupsshaped member and retained in position by said mounting plate, said gear train adapted when operated to rotate saidfirst member to cause the same to engage and disengage said contact springs to open and close the contactual engagement of said contact springs, and friction means for controllin the speed of said gear train.

22. K device of the character described including a mounting plate provided with openings, contact springs secured thereto, said springs having contactual engagement with each other, a cup-shaped member, a gear train positioned in said cup-shaped member, shafts for said gear train extending through the openings in said mounting plate, said mounting plate being secured to said cup-shaped member whereby said gear train is retained in its mounted position, a helical spring engaging one of said shafts for driving said gear train, a non-conducting member secured to another of said shafts between and in operative relation with said contact springs, said non-conducting member adapted to be operated by said gear train to cause the same to engage and disengage said contact springs to open and close the contact engagement of said contact springs.

23. A device of the character described including a cup-shaped member, a mounting plate secured to said cup-shaped member, a gear train secured between said member and said plate, normally closed impulse springs secured to said mounting plate, a non-conducting member connected to said gear train and adapted to be operated and controlled by said gear train, said non-conducting member operatively associated with said impulse springs and adapted when operated to engage said impulse springs to open said normally closed impulse springs and then to disengage said impulse springs to permit said impulse springs to close.

24. A device of the character described including a cup-shaped member, a mounting plate secured to said cup-shaped member, a gear train secured between said member and said plate, shafts for said gear train extending through said mounting plate, a coil spring operatively associated with one of said shafts for operating said gear train, means for adjusting the tension of said coil spring, normally closed impulse springs secured to said mounting plate, a cam secured to another of said shafts and positioned between said impulse springs,'said cam having integrally formed extensions normally extending parallel to 'said impulse springs and adapted to be operated by said gear train to engage said impulse springs to open said impulse springs, and means for regulating the speed of said gear train.

25. A device of the character described including a mounting plate, a pair of normally closed impulse springs secured to said mounting plate, a rotatable member disposed between said impulse springs and normally disengaging said impulse springs, means for rotating said rotatable member to cause the same to engage and disengage said impulse springs to open and close said impulse springs, and a spring member secured to said plate for engaging said rotatable member to prevent effectively revertible rotation of said rotatable member.

26. A device of the character described including a mounting plate, a gear train mounted thereon, a shaft and pinion integrally formed and positioned at an intermediate point in said gear train, a pair of impulse springs supported by said mounting plate, a cam secured to said shaft and positioned between said impulse springs, a rotatable setting member loosely connected to said gear train, a spring secured to said mounting plate and engaging said cam to prevent movement of said cam member upon the forward movement of said rotatable setting member, another pair of springs mounted on said mounting plate, a member operatively associated with said setting mem ber and adapted to normally engage one of said last pair of springs to prevent contact-ual engagement of said last pair of springs with each other, said lastv member adapted to disengage said one of said last pair of springs to permit said last pair of springs to engage each other when said setting member is moved out of its normal position.

27. A device of the character described including a mounting plate, a cup-shaped member, a gear train secured between said plate and member, a pair of impulse springs supported by said mounting plate, a cam member operatively associated with said gear train and disposed between said impulse springs, said gear train adapted to operate said cam member to cause the same to engage and disengage said impulse springs to open and close said impulse springs, and means integrally formed with said cup-shaped member for securing said device as a unit to any suitable supporting member.

28. A device of the character described including a mounting plate, a pair of impulse springs mounted thereon, a cam member rotatably disposed between said impulse springs and normally disengaging said impulse springs, said cam member when rotated adapted to engage and disengage said impulse springs to open and close said im" pulse springs, and means for causing said cam member to be rotated at a constant rate of speed. I

Signed by me at Chicago, in the county of Cook and State of Illinois, this 13th day of January, 1920.

WILLIAM KAISLING. 

